@Rami Refaeli I am on the Fort Worth side of the metroplex but the company I work for is based in North Dallas.

And could even get a second home loan if doing traditional financing.

In almost all investments, you should have a solid base of reliable, cash-flowing, and hopefully appreciating assets before striking out into something new or riskier. 

It means a $100k purchase, like a home, in 1980 is exactly equal to a $368,615.38 purchase today.     

You can refinance mobile home parks?

The guest house has STR rental history but the other two units would need to be based on projections. 

Yes, as S-Corp owners deferring salary into a Solo 401(k), you must still pay FICA taxes (Social Security & Medicare) on the deferred income since FICA is based on W-2 wages, not taxable income.

There are more buyers for SF homes, but Multifamily properties typically cash flow better as you mentioned. 

The returns were OK, but nothing to write home about. 

They also have a home vacancy tax in a lot of areas which applies to short term rentals.